11.
12.
13.
Oxazepines and thiazepines. 41 . Synthesis of 4-aryl-2,3-dihydro-2-styryl-1,5-benzothiazepines by the reaction of (E,E)-cinnamylideneacetophenones with 2-aminothiophenol and their conversion into 2,2-disubstituted 3-acetyl-2,3-dihydrobezothiazoles
Lévai, Albert
Journal of heterocyclic chemistry,
May/June 2004, Letnik:
41, Številka:
3
Journal Article
New 4‐aryl‐2,3‐dihydro‐2‐styryl‐1,5‐benzothiazepines 8–13 have been synthesized by an acid catalyzed reaction of 2‐arninothiophenol (1) and (E,E)‐cinnamylideneacetophenones 2–7. Ring contraction of ...
1,5‐benzothiazepines 8–13 provided 2,2‐disubstituted 3‐acetyl‐2,3‐dihydrobenzothiazoles 14–19 under acetylating conditions.
več
14.
15.
Dimethyldioxirane Oxidation of Exocyclic (E,E)-Cinnamylideneketones
Lévai, Albert; Silva, Artur M.S; Santos, Clementina M.M ...
Australian journal of chemistry,
01/2009, Letnik:
62, Številka:
1
Journal Article
Exocyclic (E,E)-cinnamylideneketones were oxidized by an excess of isolated dimethyldioxirane (DMDO, in acetone solution) at room temperature, providing diastereomeric mixtures of the ...
α,β:γ,δ-diepoxides. In the case of derivatives bearing an ortho-nitrocinnamylidene moiety, α,β-monoepoxides were also isolated as minor products. The structures of all new compounds and the stereochemistry of the monoepoxides and diepoxide diastereomers were established by NMR studies.
več
16.
Enantioselective reduction of C=N double bond by chromium(II) complexes of natural amino acids
Micskei, Károly; Holczknecht, Orsolya; Marchis, Valér ...
Chirality (New York, N.Y.),
2005, Letnik:
17, Številka:
9
Journal Article
Asymmetric reduction of oximes was performed by chromium(II) complexes of natural amino acids in aqueous phase or in H2O/DMF (1:1) solvent. Medium‐to‐quantitative chemoselectivity (54% to >95%) and ...
low‐to‐medium enantioselectivity (5–50% ee) were found. © 2005 Wiley‐Liss, Inc. Chirality 17:511–514, 2005.
več
17.
NMR spectroscopic structure elucidation of the products of the reaction of 3-(3-aryl-3-oxopropenyl)- chromen-4-ones with 1,2-phenylenediamine
Tóth, Gábor; Simon, András; Gondos, Tímea ...
Magnetic resonance in chemistry,
September 2006, Letnik:
44, Številka:
9
Journal Article
The reaction of 3‐(3‐aryl‐3‐oxopropenyl)chromen‐4‐ones with 1,2‐phenylenediamine resulted in the unexpected formation of ...
10a‐aryl‐1,2,10,10a‐tetrahydrobenzo‐4,5‐imidazo1,2‐apyridin‐3‐yl(2‐hydroxyphenyl)‐1‐methanones. Their structure elucidation and complete 1H and 13C assignments have been performed by a combination of various one‐ and two‐dimensional NMR experiments. Copyright © 2006 John Wiley & Sons, Ltd.
več
18.
19.
Epoxidation of ( E , E )‐Cinnamylideneacetophenones with Hydrogen Peroxide and Iodosylbenzene with Salen‐Mn III as the Catalyst
Santos, Clementina M. M.; Silva, Artur M. S.; Cavaleiro, José A. S. ...
European journal of organic chemistry,
06/2007, Letnik:
2007, Številka:
17
Journal Article
Abstract
(
E
,
E
)‐Cinnamylideneacetophenones
3a
–
j
were epoxidized under mild conditions with Jacobsen's catalyst
4
and hydrogen peroxide or iodosylbenzene as oxidants. γ,δ‐Monoepoxides and a ...
diastereomeric mixture of α,β:γ,δ‐diepoxides were obtained in each case, and only the α,β‐monoepoxide of 4‐nitrocinnamylideneacetophenone (
3d
) was isolated. The presence of a methyl group in the vinylic moiety of substrates
3i
,
j
allowed the formation of two γ,δ‐monoepoxide diastereomers. The epoxidation of (
E
,
E
)‐2′‐hydroxycinnamylideneacetophenones
3h
,
j
led to the formation of the corresponding γ,δ‐monoepoxides as well as (
E
)‐2,3‐
trans
‐3‐hydroxy‐2‐styryl‐4‐chromanones, which originated from the in situ cyclisation of 2,3‐epoxy‐1‐(2‐hydroxyphenyl)‐5‐phenyl‐4‐penten‐1‐ones. The structures of all new compounds and the stereochemistry of the mono‐ and diepoxide diastereomers were established by NMR studies. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
več
20.
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